Intermitten Oil Burner Problem PLEASE HELP!

I'm a little puzzled what my problem could be. I have a Bock (Wayne Head) oil fired water heater. A month ago I began to have problems. The fire was pulsating. I changed out the pump (12 years old anyway), the safety controlsm, photo cell, transformer, electrodes and changed every filter. Every few days the controls with break the circuit and I have to press the red button to restart the heater. The burner never looses prime and always re-starts immediately. I even tightened all the fittings to fix an air leaks. The only parts I haven't changed is the motor and aquastat.
Does anyone have any clues? I'm reluctant to call anyone because it's a real crap shoot to find someone that can diagnose an intermitten problem like this. Thanks in advance.
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You've been here before, asking the same questions. That primary relay is tripping out for a reason, and until you get someone with proper test equipment and the knowledge to use it, you're just pokin around in the dark

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Those parts have to total more than the cost of a service call. Get a pro that is familiar with your unit. Long term you'll come out ahead. While it seems intermittent to you, it may be a sold reading on test equipment.
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-snip-

Did you really do all of that before changing the nozzle? If you've got *the right* new nozzle in there-- then it is probably time to call the guy with the test equipment and see what you have.
Remember that it is shutting off for a reason. [probably safety] If the safety cutoff fails for some reason, then you run the risk of a major fire in your baement. That could ruin your day.

From here- I'd bet on a clogging or poorly adjusted nozzle. When you get enough extra oil in the firepit it puffs a bit of smoke and the electric eye shuts off the flame.
A tech could tell you that in minutes.

You've been shooting craps with parts so far. Try a relay if you really don't want to call a guy.
Jim
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